Alarm clock



FIG. 1 is a front, right and top perspective view of an alarm clock, showing my new design;

FIG. 2 is a rear, left and bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the alarm clock that form no part of the claimed design. 

CLAIM The ornamental design for an alarm clock, as shown and described. 